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L-valine is an essential amino acid and an important amino acid in the food and feed industry. The relatively low titer and low fermentation yield currently limit the large-scale application of L-valine. Here, we constructed a chromosomally engineered Escherichia coli to efficiently produce L-valine. First, the synthetic pathway of L-valine was enhanced by heterologous introduction of a feedback-resistant acetolactate acid synthase from Bacillus subtilis and overexpression of other two enzymes in the L-valine synthetic pathway. For effi
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